Mitsubishi L200. Manual — part 870
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-9
DIAGNOSIS PROCEDURE
STEP 1. Connector check: A-139 ambient
temperature sensor connector and C-44 A/C-ECU
connector
AC509975
A-139 (B)
AL
Harness side
Connector: A-139
AC509611BM
Harness side
Connector: C-44 <LHD>
AC509932BU
Harness side
Connector: C-44 <RHD>
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the connector.
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-10
STEP 2. Check the wiring harness between A-139
ambient temperature sensor connector
(terminals 1 and 2) and C-44 A/C-ECU connector
(terminals 38 and 31).
AC509975
A-139 (B)
AL
Harness side
Connector: A-139
AC509612AH
C-44
C-44
Harness side
C-138 (L)
C-137, C-138
C-33
C-137 (L)
C-33
Connectors: C-33, C-44, C-137, C-138 <LHD>
AC509930 AY
Connector: C-33 <RHD>
NOTE:
AC509932DN
Harness side
Connectors: C-44, C-137, C-138 <RHD>
C-44
C-137 (L)
C-138 (L)
C-44
C-137, C-138
Prior to the wiring harness inspection, check interme-
diate connector C-33, joint connectors C-137 and C-
138, and repair if necessary.
• Check the sensor signal line and earth line for
open and short circuit.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the wiring harness.
STEP 3. Check the ambient temperature sensor.
Refer to
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Replace the ambient temperature sensor.
STEP 4. M.U.T.-III diagnosis code
Q: Is the diagnosis code set?
YES :
Replace the automatic A/C control panel (A/
C-ECU).
NO :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction ).
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-11
Code No. B1021,B1022: Air Thermo Sensor system
Air Thermo Sensor Circuit
AIR THERMO
SENSOR
A/C-ECU
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple
COMMENTS ON TROUBLE SYMPTOM
This code is set when the air thermo sensor circuit is
open (Code No.B1022) or is short (Code No.B1021).
PROBABLE CAUSES
• Malfunction of the air thermo sensor
• Damaged the wiring harness or connectors
• Malfunction of the automatic A/C control panel (A/
C-ECU)
DIAGNOSIS PROCEDURE
STEP 1. Connector check: C-44 A/C-ECU
connector and C-45 air thermo sensor connector
AC509611BT
Harness side
C-44
C-45
C-44
Harness side
Connectors: C-44, C-45 <LHD>
C-45
AC509932 BX
Harness side
C-44
C-45
C-44
Harness side
Connectors: C-44, C-45 <RHD>
C-45
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the connector.
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-12
STEP 2. Check the wiring harness between C-44
A/C-ECU connector (terminals 39 and 38) and C-
45 air thermo sensor connector (terminals 2 and
1).
AC509612AC
Harness side
C-44
C-45
C-44
Harness side
Connectors: C-44, C-45, C-138 <LHD> C-45
C-138 (L)
C-138
AC509933AB
Harness side
C-44
C-45
C-44
Harness side
C-45
C-138 (L)
C-138
Connectors: C-44, C-45, C-138 <RHD>
NOTE: Prior to the wiring harness inspection, check
joint connector C-138, and repair if necessary.
• Check the sensor signal line and earth line for
open and short circuit.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the wiring harness.
STEP 3. Replace the A/C evaporator air outlet
thermistor, and then recheck the trouble
symptom.
Check that the A/C works normally.
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Go to Step 4.
STEP 4. M.U.T.-III diagnosis code
Q: Is the diagnosis code set?
YES :
Replace the automatic A/C control panel (A/
C-ECU).
NO :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction ).
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